Single atoms with 6000 s trapping times in optical tweezers arrays at 4 K

We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultracold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between $2.5\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{K}$ and $50\phantom{\rule{0.16em}{0ex}}\mathrm{nK}$ we study the maximal time between optical tweezer pulses that retains the number of atoms in a single trap. This time provides an estimate of the maximal number of sites in an array of time-multiplexed optical tweezers. We demonstrate evaporative cooling of atoms in arrays of up to 25 optical tweezer traps and the preparation of atoms in a box potential. Additionally, we demonstrate three different protocols for the preparation of atomic-ensemble arrays by transfer from an expanding ultracold atomic cloud. These result in the preparation of arrays of up to 74 atomic ensembles consisting of $\ensuremath{\sim}100$ atoms on average.We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultracold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between $2.5\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{K}$ and $50\phantom{\rule{0.16em}{0ex}}\mathrm{nK}$ we study the maximal time between optical tweezer pulses that retains the number of atoms in a single trap. This time provides an estimate of the maximal number of sites in an array of time-multiplexed optical tweezers. We demonstrate evaporative cooling of atoms in arrays of up to 25 optical tweezer traps and the preparation of atoms in a box potential. Additionally, we demonstrate three different protocols for the preparation of atomic-ensemble arrays by transfer from an expanding ultracold atomic cloud. These result in the preparation of arrays of up to 74 atomic ensembles consisting of $\ensuremath{\sim}100$ atoms on average.

arXiv:2203.11617Physical Review AAug 3, 20224 citations

Interaction of single atoms in optical tweezers

Yichao Yu, Lee R. Liu, Kenneth Wang +4 more

Bulletin of the American Physical SocietyMay 29, 20190 citations

In situ equalization of single-atom loading in large-scale optical tweezer arrays

Kai-Niklas Schymik, B. X. R. Alves, Étienne Bloch +6 more

We report on the realization of large assembled arrays of more than 300 single $^{87}\mathrm{Rb}$ atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with ${N}_{\mathrm{a}}=324$ atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.We report on the realization of large assembled arrays of more than 300 single $^{87}\mathrm{Rb}$ atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with ${N}_{\mathrm{a}}=324$ atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.

arXiv:2207.06500Physical Review AAug 18, 202255 citations

Optical Tweezer Arrays of Erbium Atoms

D. S. Grün, S. J. M. White, Antonio Ortu +5 more

We present the first successful trapping of single erbium atoms in an array of optical tweezers. Using a single narrow-line optical transition, we achieve deep cooling for direct tweezer loading, pairwise ejection, and continuous imaging without additional recoil suppression techniques. Our tweezer wavelength choice enables us to reach the magic trapping condition by tuning the ellipticity of the trapping light. Additionally, we implement an ultrafast high-fidelity fluorescence imaging scheme using a broad transition, allowing time-resolved study of the tweezer population dynamics from many to single atoms during light-assisted collisions. In particular, we extract a pair-ejection rate that qualitatively agrees with the semiclassical predictions by the Gallagher-Pritchard model. This Letter represents a promising starting point for the exploration of erbium as a powerful resource for quantum simulation in optical tweezers.We present the first successful trapping of single erbium atoms in an array of optical tweezers. Using a single narrow-line optical transition, we achieve deep cooling for direct tweezer loading, pairwise ejection, and continuous imaging without additional recoil suppression techniques. Our tweezer wavelength choice enables us to reach the magic trapping condition by tuning the ellipticity of the trapping light. Additionally, we implement an ultrafast high-fidelity fluorescence imaging scheme using a broad transition, allowing time-resolved study of the tweezer population dynamics from many to single atoms during light-assisted collisions. In particular, we extract a pair-ejection rate that qualitatively agrees with the semiclassical predictions by the Gallagher-Pritchard model. This Letter represents a promising starting point for the exploration of erbium as a powerful resource for quantum simulation in optical tweezers.

arXiv:2406.16146Physical Review LettersNov 26, 202416 citations

Manipulating single atoms with optical tweezers

Axel Kuhn

Jan 1, 20140 citations

50\phantom{\rule{0.16em}{0ex}}\mathrm{nK}

we study the maximal time between optical tweezer pulses that retains the number of atoms in a single trap. This time provides an estimate of the maximal number of sites in an array of time-multiplexed optical tweezers. We demonstrate evaporative cooling of atoms in arrays of up to 25 optical tweezer traps and the preparation of atoms in a box potential. Additionally, we demonstrate three different protocols for the preparation of atomic-ensemble arrays by transfer from an expanding ultracold atomic cloud. These result in the preparation of arrays of up to 74 atomic ensembles consisting of $\ensuremath{\sim}100$ atoms on average.

We report on the realization of large assembled arrays of more than 300 single

^{87}\mathrm{Rb}

atoms trapped in optical tweezers in a cryogenic environment at $\ensuremath{\sim}4$ K. For arrays with

{N}_{\mathrm{a}}=324

atoms, the assembly process results in defect-free arrays in $\ensuremath{\sim}37%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezer, based on the analysis of the fluorescence time traces of atoms loaded in the traps.